Overview
The Schneider Electric LRD12 is a bimetallic thermal overload relay designed for reliable motor protection in industrial automation and motor control applications. Part of the proven TeSys Deca family, this Class 10A relay provides accurate overload and phase-loss detection with simple, field-proven installation on Schneider TeSys D contactors.
Key Features
- Adjustable 5.5–8A Rating: Current rating of 5.5-8 Amps with Class 10A trip protection per IEC 60947-4-1
- Phase-Loss Sensitivity: Compensated with phase failure sensitive protection for single-phase loss detection
- Dual Reset Options: Manual or automatic reset modes, selectable by dial
- Multiple Terminal Options: Installation in screw clamp terminals, by spring terminal, by ring terminals and by EverLink terminals
- Compact Direct-Mount Design: Can be combined with TeSys d contactors to form an extremely compact starter
- Trip Indicator & Diagnostics: Visual trip indication for easy fault diagnostics
Technical Specifications
The following specifications apply to the Schneider Electric LRD12 in standard IEC/UL configuration:
| Thermal Adjustment Range | 5.5–8 A |
| Thermal Class | Class 10A per IEC 60947-4-1 |
| Contact Configuration | 1NO, 1NC |
| Voltage Rating (Power Circuit) | 600/690VAC |
| Frequency Range | 0–400 Hz |
| Protection Type | Bimetallic Thermal, ambient-compensated |
| Poles | 3 Pole |
| Reset Options | Manual and automatic |
| Height | 2.60 in (66 mm) |
| Width | 1.77 in (45 mm) |
| Depth | 2.76 in (70 mm) |
| IP Rating | IP20 |
| Operating Temperature | –20 to +60°C |
| Certifications | IEC, UL, CSA, CCC, EAC, ATEX, DNV-GL |
Typical Applications
The Schneider Electric LRD12 is used in a wide range of motor-control and industrial automation applications, including:
- AC motor starters and soft-start panels (lighting, HVAC, pump control)
- Industrial machinery automation and process control systems
- Marine and offshore equipment protection (DNV-GL certified)
- Direct mounting on TeSys D contactors in compact control cabinets
- Phase-loss and overload protection in multi-motor distributions
Compatibility & Replacements
Compatible With
- LC1D09, LC1D12, LC1D18, LC1D25, LC1D32, LC1D38 contactors
- TeSys D contactor family
- TeSys Deca thermal overload relay series
- IEC 60947-4-1 compliant motor protection circuits
- 600V and 690V AC power distribution systems
Replaces / Drop-In Replacement For
The Schneider Electric LRD12 is the direct replacement for earlier Telemecanique LRD12 thermal overload relays. Verify compatibility with your system integrator before ordering if upgrading from non-Schneider thermal overload devices.
Works With
- TeSys D and TeSys Deca contactor platforms
- Industrial control and automation software (via relay contacts only; no digital interface)
- Manual and automatic motor starter control circuits
- Remote electrical reset systems
- Pre-wiring kits and terminal block mounting accessories
